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BNC connectors 75 Ohm versus 50 Ohm?
Roy Lewallen wrote in
: I've never seen a correctly assembled connector come off. Another story, but with a different outcome. I worked in a training school at one stage, and we thought we would get trainees to make up BNC RG58 patch cables as a practical exercise, and we would feed the output into our satellite labs where cables didn't seem to last long (trainees pulled equipment trolleys around by the coax if it didn't reach the desired socket). Total failure, the BNC field serviceable connectors were just too complicated for dissinterested trainees more interested in discussing fast cars than concentrating on the job... and they had no stake in it, if the cables didn't work, it didn't matter too much. Solving the problem of the connectors pulling off led me to the Amphenol specs, and I found that the pull out spec for the field serviceable connectors was *much* lower than the spec for the crimp connectors. So, I bought a quality crimp tool (in those days, it was a few hundred dollars), and some Kings crimp connectors, and we switched the classes to use the crimp components and a trim jig. The outcome was much better, fewer faulty cables, and the crimped cable retention was much better and consistently so. No I know that one of the large suppliers to hams advertises "crimped, not soldered", but that is just a blatant case of playing to the market. A bit like the single core 4:1 Guanella balun that manufacturers attribute to Sevik's assurance that it will work fine on a fully floating load... whan antenna system is a fully floating load. The theme is the customer is always right, if he wants something that doesn't make sense, see Rule 1. An interesting new connector type is the "compression connectors", "Snap- n-Seal" is a proprietary name. I tried some of these on RG6, and a bit suspicious of the cable retention mechanism, every one I tested using different types of RG6 (including QS), hung on until the cable tore apart some distance from the connector. Owen |
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